The Watts Series530 C are spring operated bronze relief valves designed to be used only as protection from the build up of excessive pressure in systems containing water, oil or air.

• 美国瓦茨530C系列阀门是弹簧驱动青铜安全阀，仅仅适用于包含水、或气的系统中，用来防止系统内压力过大。